| Title: NULL Handling |
| |
| |
| |
| <P>Handling of Java nulls as operands is no different from normal values. Instead of using special conditional operators, like SQL does, EQUAL_TO and NOT_EQUAL_TO expressions can be used directly with null values. It is up to Cayenne to translate expressions with nulls to the valid SQL.</P> |
| |
| <P>For example:</P> |
| |
| <DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent"> |
| <PRE class="code-java"><SPAN class="code-comment">// <SPAN class="code-keyword">this</SPAN> expression will be translated by Cayenne to the SQL like: |
| </SPAN><SPAN class="code-comment">// ...WHERE BIRTH_DATE IS NOT NULL |
| </SPAN>Expression exp = ExpressionFactory.noMatchExp(<SPAN class="code-quote">"birthDate"</SPAN>, <SPAN class="code-keyword">null</SPAN>); |
| </PRE> |
| </DIV></DIV> |
